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        function add(name,age){
            this.name=name
            this.age=age
            return 1
        }
        add.prototype.do=function(){
            console.log('你好world');
        }

        // 手写new
        function bdd(contry,...arg){
            // 1.创建一个对象
            const obj={};
            // 2.调用构造函数把构造函数的this只想我们创建的对象
            const re=contry.apply(obj,arg)

            // 3.把obj
        }
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